CVE-2023-51764

{"id": "CVE-2023-51764", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "published": "2023-12-24T05:15:08.273", "references": [{"url": "http://www.openwall.com/lists/oss-security/2023/12/24/1", "tags": ["Mailing List", "Third Party Advisory"], "source": "[email protected]"}, {"url": "http://www.openwall.com/lists/oss-security/2023/12/25/1", "tags": ["Mailing List", "Third Party Advisory"], "source": "[email protected]"}, {"url": "http://www.openwall.com/lists/oss-security/2024/05/09/3", "source": "[email protected]"}, {"url": "https://access.redhat.com/security/cve/CVE-2023-51764", "tags": ["Third Party Advisory"], "source": "[email protected]"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2255563", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "[email protected]"}, {"url": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html", "tags": ["Technical Description"], "source": "[email protected]"}, {"url": "https://github.com/duy-31/CVE-2023-51764", "tags": ["Exploit", "Third Party Advisory"], "source": "[email protected]"}, {"url": "https://github.com/eeenvik1/CVE-2023-51764", "tags": ["Exploit", "Third Party Advisory"], "source": "[email protected]"}, {"url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html", "source": "[email protected]"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/", "source": "[email protected]"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/", "source": "[email protected]"}, {"url": "https://lwn.net/Articles/956533/", "source": "[email protected]"}, {"url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/", "tags": ["Technical Description", "Third Party Advisory"], "source": "[email protected]"}, {"url": "https://www.openwall.com/lists/oss-security/2024/01/22/1", "source": "[email protected]"}, {"url": "https://www.postfix.org/announcements/postfix-3.8.5.html", "source": "[email protected]"}, {"url": "https://www.postfix.org/smtp-smuggling.html", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "[email protected]"}, {"url": "https://www.youtube.com/watch?v=V8KPV96g1To", "tags": ["Exploit"], "source": "[email protected]"}, {"url": "http://www.openwall.com/lists/oss-security/2023/12/24/1", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.openwall.com/lists/oss-security/2023/12/25/1", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.openwall.com/lists/oss-security/2024/05/09/3", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://access.redhat.com/security/cve/CVE-2023-51764", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2255563", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html", "tags": ["Technical Description"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.com/duy-31/CVE-2023-51764", "tags": ["Exploit", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.com/eeenvik1/CVE-2023-51764", "tags": ["Exploit", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.fedoraproject.org/archives/list/[email protected]/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.fedoraproject.org/archives/list/[email protected]/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lwn.net/Articles/956533/", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/", "tags": ["Technical Description", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://www.openwall.com/lists/oss-security/2024/01/22/1", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://www.postfix.org/announcements/postfix-3.8.5.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://www.postfix.org/smtp-smuggling.html", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://www.youtube.com/watch?v=V8KPV96g1To", "tags": ["Exploit"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-345"}]}], "descriptions": [{"lang": "en", "value": "Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain other options that exist in recent versions). Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Postfix supports <LF>.<CR><LF> but some other popular e-mail servers do not. To prevent attack variants (by always disallowing <LF> without <CR>), a different solution is required, such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9."}, {"lang": "es", "value": "Postfix hasta 3.8.4 permite el contrabando SMTP a menos que se configure con smtpd_data_restrictions=reject_unauth_pipelining (u otras opciones que existen en versiones recientes). Los atacantes remotos pueden utilizar una t\u00e9cnica de explotaci\u00f3n publicada para inyectar mensajes de correo electr\u00f3nico que parecen originarse en el servidor Postfix, lo que permite omitir un mecanismo de protecci\u00f3n SPF. Esto ocurre porque Postfix admite . pero algunos otros servidores de correo electr\u00f3nico populares no lo hacen. Para evitar variantes de ataque (al no permitir siempre sin ), se requiere una soluci\u00f3n diferente: la opci\u00f3n smtpd_forbid_bare_newline=yes con una versi\u00f3n m\u00ednima de Postfix de 3.5.23, 3.6.13, 3.7.9, 3.8.4, o 3.9."}], "lastModified": "2025-11-04T22:15:56.210", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0598FFA3-9DB8-4D01-9049-3834B6B53000", "versionEndExcluding": "3.5.23"}, {"criteria": "cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7AD4364D-F93C-499E-8ECA-5228354D20B6", "versionEndExcluding": "3.6.13", "versionStartIncluding": "3.6.0"}, {"criteria": "cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7174307B-1249-47B5-BE66-9194AC26BA15", "versionEndExcluding": "3.7.9", "versionStartIncluding": "3.7.0"}, {"criteria": "cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7A422C34-3E0E-4C3F-8EA9-4F442D88057D", "versionEndExcluding": "3.8.4", "versionStartIncluding": "3.8.0"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CC559B26-5DFC-4B7A-A27C-B77DE755DFF9"}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8EDB836-4E6A-4B71-B9B2-AA3E03E0F646"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}], "operator": "OR"}]}], "sourceIdentifier": "[email protected]"}